package com.gxuwz.medical.web.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.gxuwz.medical.config.Constant;
/**
 * 
 * @author 演示
 *
 */
public class AuthorFilter implements Filter {

	public void destroy() {}

	public void init(FilterConfig config) throws ServletException {
		

	}
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
	     HttpServletRequest req=(HttpServletRequest)request;
	     HttpServletResponse resp=(HttpServletResponse)response;
	     HttpSession session=req.getSession();
	     String id=(String)session.getAttribute(Constant.IDENTIFIER);
	     if(id==null){
	    	resp.sendRedirect(req.getContextPath()+"/session.jsp");
	     }else{
	    	 chain.doFilter(req, resp);
	     }
	}


}
